HTP ELP-199 - Manual (Page 45)

45
LP-294 REV. 2.20.14
D. LINE VOLTAGE WIRING FOR STANDARD BOILER
1. Connect incoming power wiring to the line voltage terminal strip in the electrical junction box at terminals 120V, Neutral, Ground
(shown in Figure 27).
2. A line voltage fused disconnect switch may be required, externally mounted and connected according to local codes that may apply.
3. Connect the boiler pump as shown in Figure 27 to the terminals marked 1
– (HOT), 2 – (NEUT), and 3 – (GND). The connections
shown are suitable for a maximum continuous pump draw of 4 amps at 120 volts. If the pump requires more current or voltage than the
120 volts supplied, an external motor starter or contactor will be required.
4. Connect the DHW pump (if used) as shown in Figure 27 to the terminals marked 4
– (HOT), 5 – (NEUT), and 6 – (GND). The
connections are suitable for a maximum continuous pump draw of 4 amps at 120 volts. If the pump requires more current or voltage
than the 120 volts supplied, an external motor starter or contactor will be required.
NOTE: The combined current draw of the boiler and CH pump cannot exceed 4 amps. If more than 4 amps total or a voltage other than
120 volts is required, it will be necessary to use an external motor starter or contactor.
5. Connect the system pump (if used) as shown in Figure 27 to the terminals marked 9
– (HOT), 2 – (NEUT), and 3 – (GND). Connect
the power supply for the system pump to the terminal marked 8. This is often accomplished by placing a jumper wire from the terminal
marked 120V (HOT) to the terminal marked 8. The connections shown are suitable for a maximum continuous pump draw of 5 amps at
120 volts. If the pump requires more current or voltage than the 120 volts supplied, an external motor starter or contactor will be
required.
E. ALARM CONNECTIONS
An optional Interface Module is available that provides a dry contact alarm
output (normally open).
F. LOW VOLTAGE CONNECTIONS FOR STANDARD BOILER
1. All low voltage cables should enter the electrical junction box through the
provided knock out holes as shown at right.
2. Connect all low voltage field devices to the low voltage terminal strip
located in the electrical junction box.
G. THERMOSTAT
1. Connect the room thermostat to the terminals marked THERMOSTAT
(14 and 15) in the electrical junction box (see Figure 27). Alternately, any
dry contact closure across these terminals will cause the boiler to run. Take
caution to ensure neither of the terminals becomes connected to ground.
Neither of these connections can become grounded at any time. If an
external transformer is used, such as when powering zone valves, care
must be taken to ensure, a) that the transformer is on the same circuit that
supplies power to the boiler, and b) that the connections are connected with the correct polarity.
If an external transformer is used and boiler runs continuously after wiring to the thermostat terminals, reverse the 2 wires on the
thermostat terminals to correct the problem.
2. Mount the thermostat on an inside wall as central as possible to the area being heated, but away from drafts or heat producing
devices such as television sets that could influence the ability of the thermostat to measure room temperature.
3. If the thermostat is equipped with an anticipator and it is connected directly to the boiler, the anticipator should be set at .1 amps. If
the thermostat is connected to other device(s), the anticipator should be set to match the power requirements of the device(s). See the
instruction manual of the connected device(s) for further information.
NOTE: On cascaded systems, wire the thermostat signal ONLY to the Master boiler.
When a powered transformer circuit exists in the installation location, the polarity of the thermostat connection may result in constant
circulation or operation. Reversal of the thermostat connections will correct this issue.
H. OUTDOOR SENSOR
There is no connection required if an outdoor sensor is not used in the installation.
1. Use minimum 22 AWG wire for runs of 100 feet or less and minimum 18 AWG wire for runs up to 150 feet.
Figure 24 – Knockout Locations